Water Quality in Rancho Cucamonga, CA (92356)
EPA violation data for public water systems serving ZIP code 92356.
Active Health Violations
25 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 91% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
6,543
Population
48
Water Systems
67
Violations (5yr)
25
Health-Based
Location
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Water Systems Serving This Area (48)
Chino Basin Mwd
San Gabriel Valley Wc - Fontana
San Bernardino City
Cucamonga Valley Water District
Ontario Municipal Utilities Company
Victorville Water District
San Bernardino Valley Wd
East Valley Water District
West Valley Water District
Hesperia Wd
Juniper Riviera Cwd
1 health-basedJubilee Mwc
Lucerne Valley Elementary School
Center Water Co
Lucerne Valley High School
So Cal Water Co Victorville 6
Desert Springs Mwc
Moss Mobile Manor
Moose Lodge 2096
All resolvedBar H Mwc
10 health-basedLucerne Valley Mwc
Lucerne Vista Mwc
Gordon Acres Water Co
13 health-basedHitchin Lucerne Inc
Mitsubishi Cement Plant Cushenbury
Desert Dawn Mwc
All resolvedTall Trees Mhp
R W Ranch
Omya California, A Division Of Omya Inc
Inslee'S Trailer Park
West End Mwc
All resolvedSpecialty Minerals Inc
Rancho Pino Verde
1 health-basedSosas Water System
All resolvedArco Service Station
Behind The Chute Saloon (Aka: Dj S)
Geetam Rajneesh Sannyas Ashram
Mountain View Continuation School
All resolvedApple Valley Guest Ranch
Country Styles (Was Pops & Pams)
Country Kitchen
Caltrans - Cushenbury
Rocket Service Station
Ss Hert Trucking Inc
Chisel Inn
Portal Motel
El Vaquero Rancho
New Beginnings Mhp
Contaminants Found
At high levels, nitrate can cause blue baby syndrome in infants.
Missed testing deadlines — not a detection of bacteria.
Annual water quality report delivery requirement.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
Similar to nitrate — harmful to infants at high levels.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Jan 2025
How Does This Compare?
Rancho Cucamonga (92356) has more violations than 91% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 67.
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.